https://www.backyardchickens.com/threads/free-roosters-to-good-home.1597592/
There is this person who has mixed roosters of calmer breeds. I think it was Ameraucana and barred rock mixes.
Honestly I have no idea. You could look around at older unread comments as there is tons of people looking to get rid of their extra roosters of all ages. Maybe keep him separate if he's older and wait till the girls are bigger or get a younger rooster.